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s0_to_vz.c
134 lines (97 loc) · 3.4 KB
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s0_to_vz.c
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/*
S0/Impulse to Volkszaehler
Compile as follows:
gcc -o s0 s0.c -lwiringPi
Run as follows:
sudo ./s0
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <wiringPi.h>
#include <curl/curl.h> /* multiprotocol file transfer library */
// Use GPIO Pin 17, which is Pin 0 for wiringPi library
#define PIN 0
#define NAME "s0_to_vz"
#define VERSION "1.0"
/* Hostname, FQDN or IP of your VZ - normaly this should be 'localhost' */
const char* VZSERVER = "demo.volkszaehler.org";
/* Path to the VZ middleware.php script, WITHOUT preposed and trailing slash */
const char* VZPATH = "middleware.php";
/* HTTP Port of your VZ */
const int VZPORT = 80;
const char* VZUUID = "a03572f0-9d6b-11e3-ae04-d7f3e0294bbb";
CURL *easyhandle;
CURLM *multihandle;
static char url[128]="";
// the event counter
volatile int eventCounter = 0;
unsigned long long unixtime() {
struct timeval tv;
gettimeofday(&tv,NULL);
unsigned long long ms_timestamp = (unsigned long long)(tv.tv_sec) * 1000
+ (unsigned long long)(tv.tv_usec) / 1000;
return ms_timestamp;
}
void update_curl_handle() {
static unsigned long long ut_last=0;
unsigned long long ut = unixtime();
if (ut_last && ut - ut_last > 120) {
curl_multi_remove_handle(multihandle, easyhandle);
sprintf(url, "http://%s:%d/%s/data/%s.json?ts=%llu",
VZSERVER, VZPORT, VZPATH, VZUUID, ut);
//printf("period=%llu", ut-ut_last);
curl_easy_setopt(easyhandle, CURLOPT_URL, url);
curl_multi_add_handle(multihandle, easyhandle);
}
ut_last = ut;
}
// -------------------------------------------------------------------------
// myInterrupt: called every time an event occurs
void myInterrupt(void) {
static CURLMcode multihandle_res;
static int running_handles;
eventCounter++;
update_curl_handle();
if ((multihandle_res = curl_multi_perform(multihandle, &running_handles))
!= CURLM_OK) {
fprintf(stderr, "HTTP_POST(): %s\n",curl_multi_strerror(multihandle_res));
}
}
// -------------------------------------------------------------------------
// main
int main(void) {
FILE* devnull = NULL;
static char errorBuffer[CURL_ERROR_SIZE+1];
curl_global_init(CURL_GLOBAL_ALL);
multihandle = curl_multi_init();
easyhandle = curl_easy_init();
//curl_easy_setopt(easyhandle, CURLOPT_URL, url);
curl_easy_setopt(easyhandle, CURLOPT_POSTFIELDS, "");
curl_easy_setopt(easyhandle, CURLOPT_USERAGENT, NAME " " VERSION );
curl_easy_setopt(easyhandle, CURLOPT_WRITEDATA, devnull);
curl_easy_setopt(easyhandle, CURLOPT_ERRORBUFFER, errorBuffer);
curl_multi_add_handle(multihandle, easyhandle);
// sets up the wiringPi library
if (wiringPiSetup () < 0) {
fprintf (stderr, "Unable to setup wiringPi: %s\n", strerror (errno));
return 1;
}
if ( wiringPiISR (PIN, INT_EDGE_RISING, &myInterrupt) < 0 ) {
fprintf (stderr, "Unable to setup ISR: %s\n", strerror (errno));
return 1;
}
// display counter value every second.
while ( 1 ) {
printf( "%d Events, last: %s\n", eventCounter, url );
FILE *fp = fopen ("/tmp/s0Events", "w");
fprintf(fp, "%d", eventCounter);
fclose(fp);
eventCounter = 0;
delay( 10000 ); // wait 10 second
}
curl_global_cleanup();
return 0;
}